接种 Endoconidiophora fujiensis 后,Larix kaempferi 和 Larix olgensis 的致病性和诱导抗性。

IF 3.5 2区 农林科学 Q1 FORESTRY Tree physiology Pub Date : 2024-07-02 DOI:10.1093/treephys/tpae069
Ya Liu, Qinzheng Zhou, Di Wu, Caixia Liu, Xiaolin Wu, Zheng Wang, Huimin Wang, Quan Lu
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引用次数: 0

摘要

随着气候变暖和经济全球化,昆虫-微生物组合越来越多地成为全球各种毁灭性森林病害的罪魁祸首。日本落叶松(Larix kaempferi)因其成活率高、成熟快、机械性能强,在中国被广泛栽培。Endoconidiophora fujiensis 是一种与 Ips subelongatus 相关的卵菌纲真菌,已被确认为日本落叶松的致命病原体。然而,在中国,有关富士鹅膏菌在山杏树上致病性的研究还很缺乏。因此,我们研究了E. fujiensis在引进落叶松和本地落叶松中的致病性,并比较了两种树种在生理和基因表达方面对病原体的诱导抗性反应。在同一生长季节,同时接种了5年生的落叶松树苗和25年生的成年树。E. fujiensis在两种落叶松中都表现出较高的致病性,但与L. olgensis成树相比,对L. kaempferi的致病性尤为突出;L. olgensis成树对E. fujiensis的抗性强于L. kaempferi成树,这反映在防御性单萜烯(如月桂烯、3-卡蒈烯和柠檬烯)的积累较高,以及防御基因过氧化氢酶(CAT)和致病相关蛋白1(PR1)的诱导较早。这项研究有助于我们了解与树皮甲虫相关的卵菌纲真菌与寄主落叶松之间的相互作用,从表型反应到次生代谢产物的改变,再到防御和代谢相关基因的激活,为今后落叶松病虫害的防治奠定了宝贵的基础。
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Pathogenicity and induced resistance in Larix kaempferi and Larix olgensis inoculated with Endoconidiophora fujiensis.

With climate warming and economic globalization, insect-microbe assemblages are becoming increasingly responsible for various devastating forest diseases worldwide. Japanese larch (Larix kaempferi) is extensively cultivated in China because of its high survival rate, rapid maturation and robust mechanical properties. Endoconidiophora fujiensis, an ophiostomatoid fungus associated with Ips subelongatus, has been identified as a lethal pathogen of L. kaempferi in Japan. However, there is a dearth of research on the pathogenicity of E. fujiensis in larches in China. Therefore, we investigated the pathogenicity of E. fujiensis in introduced L. kaempferi and indigenous larch (Larix olgensis) trees and compared the induced resistance responses to the pathogen in both tree species in terms of physiology and gene expression. Five-year-old saplings and 25-year-old adult trees of L. olgensis and L. kaempferi were inoculated in parallel during the same growing season. Endoconidiophora fujiensis exhibited high pathogenicity in both larch species, but particularly in L. kaempferi compared with L. olgensis adult trees; adult L. olgensis was more resistant to E. fujiensis than adult L. kaempferi, which was reflected in higher accumulation of defensive monoterpenes, such as myrcene, 3-carene and limonene and the earlier induction of defense genes catalase (CAT) and pathogenesis-related protein 1 (PR1). This study contributes to our understanding of the interactions between bark beetle-associated ophiostomatoid fungi and host larches, from phenotypic responses to alterations in secondary metabolites via defense- and metabolism-related gene activation, providing a valuable foundation for the management of larch diseases and pests in the future.

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来源期刊
Tree physiology
Tree physiology 农林科学-林学
CiteScore
7.10
自引率
7.50%
发文量
133
审稿时长
1 months
期刊介绍: Tree Physiology promotes research in a framework of hierarchically organized systems, measuring insight by the ability to link adjacent layers: thus, investigated tree physiology phenomenon should seek mechanistic explanation in finer-scale phenomena as well as seek significance in larger scale phenomena (Passioura 1979). A phenomenon not linked downscale is merely descriptive; an observation not linked upscale, might be trivial. Physiologists often refer qualitatively to processes at finer or coarser scale than the scale of their observation, and studies formally directed at three, or even two adjacent scales are rare. To emphasize the importance of relating mechanisms to coarser scale function, Tree Physiology will highlight papers doing so particularly well as feature papers.
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